Earl's Brake Booster Check Valve - 13/16 in Hose Barb Inlet - 6 AN Male Outlet - Black 3419WH 7/16" Hi-Tech (CB EX)The COMP

7/16" Hi-Tech (CB EX)The COMP Cams philosophy has never changed: make the highest performing products possible and lead the industry in technological development

28 Spline Pinion

Minimum Engine Vacuum Requirements: 10-12 in-Hg

2001-2003 Chevrolet Silverado 1500 HD Fleetside 78

Four forehead intake vents

Earl's Brake Booster Check Valve - 13/16 in Hose Barb Inlet - 6 AN Male Outlet - Black 3419WH 7/16" Hi-Tech (CB EX)The COMPThis check valve is for use with naturally aspirated engines only (not for use w Turbocharged & Supercharged engines). Machined from Billet 6061 T6 Aluminum Anodized Black or Clear for Superior Corrosion Protection Choose from 6AN Male, 3 8" Barb, or 1 2" Barb for Vacuum Hose Fits Brake Boosters w 13 16" Hole for Grommet 1 2" Barb Fits Most GM LS Engines, 3 8" Barb Fits Most Other Domestic & Import Engines, 6AN Male for Use w AN Hose Valve Material: